I have had Lightroom 6 for quite a while, and it had worked flawlessly. However, recently my iMac (27-inch, Mid 2010) screen blacked out for several weeks. I finally decided to take the computer to Apple for a check-up. To them, it seemed like a simple P-Ram Zap. A few taps on the keyboard, and a diagnostic secret keystrokes, that I never knew, and poof, my screen was up and running again. This weekend, my Lightroom would not open, and when I left clicked the Lightroom icon, it read "Application Not Responding".
I have tried option + shift, to reset the preferences, nothing happened.
I have tried Disk Utilities's First Aid's: 1) Verify Disk Permissions, 2) Repair Disk Permissions, 3) Verify Disk, and 4) Repair Disk, nothing helped.
What am I doing wrong, and is there another method of getting the program up and running again?
Have a look in the Lightroom Folder in Pictures (or where ever you have placed your catalog and see if there is a .lock file in there. If so, delete it.